.header{
    width: 100%;
    padding: 2rem;
    background-color: #222133;
    border-radius: 2rem;
    display: flex;
    justify-content: left;
}
.toLink{
    color: #B0AFB5;
    text-decoration: none;
    display: block;
    box-sizing: border-box;
    margin-right: 4rem;
    position: relative;
}
a:hover{
    color: white;
}
.toChecked{
    color: white;
}
.toChecked::after{
    content: '';
    display: block;
    width: 100%;
    height: .4rem;
    position: absolute;
    bottom: -1rem;
    left: 0;
    background-color: thistle; /* 不支持线性渐变时显示 */
    background-image: linear-gradient(to right,#6980F5, #BC67F1);
}